For sure, powders all burn at different rates and different temperatures. Local outside air temperature, elevation, etc also play into the mix. I asking in terms of generalities, if there is such a thing.

Primarily, I was wondering if the manufacturers had published any data or if anyone had done their own tests with different powders to make a somewhat definitive statement on the matter.

There's a ton of info on the 'net about this very subject, if you go lookin' for it. Just figure out what powder yer gonna use & go to the manufacturer's load data page on their website to see what they recommend.

I don't give reloading advice or load formula's on this forum any longer. Too many idiots that will argue with a brick wall to waste time on. If you really want to know, give it a try and post results or consult a reputable manual...

For Bullseye/TG and just about every other non-magnum (H110/W296) powder, I just use SPPs. It's usually for my cast plinker loads otherwise I'd be shooting full bore H110 powder firebreathing loads with a CCI magnum primer.

I don't give reloading advice or load formula's on this forum any longer. Too many idiots that will argue with a brick wall to waste time on. If you really want to know, give it a try and post results or consult a reputable manual...

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I don’t know who the heck this is directed at but if it is me, I am pretty sure that I didn’t ask anyone for any reloading advice.

For sure, powders all burn at different rates and different temperatures. Local outside air temperature, elevation, etc also play into the mix. I asking in terms of generalities, if there is such a thing.

Primarily, I was wondering if the manufacturers had published any data or if anyone had done their own tests with different powders to make a somewhat definitive statement on the matter.

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Click to expand...

Anecdotally I can tell you:
1) magnum primers are generally match up with certain powders, not certain cartridges.
2) Using a standard primer when a magnum is called for can result in poor ignition, incomplete burn, erratic velocity
3) using a magnum primer when a standard is specified can have any result from no change to unexpected pressure spikes.
4) SRP is basically equivalent to SPM as long as your gun will set them off.
5) Whatever you're doing, start low and work up.

Sorry I can't be definitive but I don't think that's possible outside of a lab.

Anecdotally I can tell you:
1) magnum primers are generally match up with certain powders, not certain cartridges.
2) Using a standard primer when a magnum is called for can result in poor ignition, incomplete burn, erratic velocity
3) using a magnum primer when a standard is specified can have any result from no change to unexpected pressure spikes.
4) SRP is basically equivalent to SPM as long as your gun will set them off.
5) Whatever you're doing, start low and work up.

Sorry I can't be definitive but I don't think that's possible outside of a lab.

OK, this question was a perplexing one and so I decided to test it out for myself to see what I came up with. I tried to be as exacting as I could be without completely going down a rabbit hole, i.e., I did not weigh and sort every projectile.

DISCLAIMER: This is my load data utilizing my components, pistol, chronograph and reloading skills. These are my results and your results might vary. Do not use this loading data or the results as a definitive guide on what you should reload. You alone, are responsible for what YOU reload.

Here are the results and just for reference, the last chronograph results you will see is for factory Federal 357 158 Gr JSP ammunition.

Edited to show proper powder charge used in this post. Thanks Crazy Carl!

OK, this question was a perplexing one and so I decided to test it out for myself to see what I came up with. I tried to be as exacting as I could be without completely going down a rabbit hole, i.e., I did not weigh and sort every projectile.

DISCLAIMER: This is my load data utilizing my components, pistol, chronograph and reloading skills. These are my results and your results might vary. Do not use this loading data or the results as a definitive guide on what you should reload. You alone, are responsible for what YOU reload.

Here are the results and just for reference, the last chronograph results you will see is for factory Federal 357 158 Gr JSP ammunition.